Change selected option in select

Question

I want to change selected option in select after click on button

view.html file

<select class="language-selector">
  <option *ngFor="let language of outputLanguageList" 
  value="{{language.shortName}}" >{{language.languageName}}</option>
</select>

<button (click)="changeLanguage()">PL-EN</button>

component.ts file

outputLanguageList:TranslateLanguage[]=[];

ngOnInit(): void {
    this.outputLanguageList.push({languageName:"Polski",shortName:"pl"});
    this.outputLanguageList.push({languageName:"Angielski",shortName:"en"});
    this.outputLanguageList.push({languageName:"Hiszpański",shortName:"es"});
    this.outputLanguageList.push({languageName:"Niemiecki",shortName:"de"});
    this.outputLanguageList.push({languageName:"Rosyjski",shortName:"ru"});
    this.outputLanguageList.push({languageName:"Ukraiński",shortName:"ua"});
    this.outputLanguageList.push({languageName:"Słowacki",shortName:"sk"});  
}

changeLanguage(){
    //code that will change the selected option in selectbox
}

It is possible make this in Angular?

I try do something like this:

changeLanguage(@Inject(DOCUMENT) document:Document){
    document.getElementById("asda").value("Polski");
}

But i got error: Property 'value' does not exist on type 'HTMLElement'

OctavianM · Accepted Answer · 2022-02-20 20:57:56Z

You could use the ngModel directive to update the value (either from the UI, or from the .ts file):

<select class="language-selector" [(ngModel)]="selectedLanguage">
  <option *ngFor="let language of outputLanguageList" 
  value="{{language.shortName}}" >{{language.languageName}}</option>
</select>

<button (click)="changeLanguage()">PL-EN</button>

In the .ts file you need to declare the selectedLanguage property and give it an initial value:

public selectedLanguage: string | null = null;

In your changeLanguageMethod you only need this:

changeLanguage(){
  this.selectedLanguage = "Polski";
}

The rest of your code can stay as it is.

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